William,
Welcome to the PGCA. Glad you are here and hope to hear more from you. The best bet is to start a new thread on your grandfathers Parker. It sounds wonderful being on a 1/2 frame with short original barrels and tight chokes. I could not venture a guess on value without seeing some very good clear pictures. I have my fathers Parker and other family Parkers that are priceless to me.
Kindest, Harry
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